package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService{
    @Autowired
    private DishService dishService;  //菜品
    @Autowired
    private SetmealService setmealService; //套餐

    /**
     * 根据id删除分类，删除之前需要进行判断
     * @param id
     */
    @Override
    public void remove(Long id) {
        //--id 查菜品
        LambdaQueryWrapper<Dish> qwr_dish=new LambdaQueryWrapper<>();
        qwr_dish.eq(Dish::getCategoryId,id);
        int count = dishService.count(qwr_dish);
        //--有关联
        if(count>0){
            //已经关联菜品，抛出一个业务异常
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }

        //--id 查套餐
        LambdaQueryWrapper<Setmeal> qwr_setmeal=new LambdaQueryWrapper<>();
        qwr_setmeal.eq(Setmeal::getCategoryId,id);
        int count2 = setmealService.count(qwr_setmeal);
        //--有关联
        if(count2>0){
            //已经关联套餐，抛出一个业务异常
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }
        //正常删除分类
        super.removeById(id);

    }
}
